Unless I'm screwing something up, I think there are three possible answers to this question, and you're looking for the integer one? Given the answers you are looking for, A and C are always the triangles that have one full side of your square, but that's not specified in the problem statement.
I took the scenic route.
Back and Forth Rows
Project Euler: Problem 6, Natural numbers, squares and sums.
01 - Scalar variables
Reverse a matrix
Sum of series II
convert between ascii and characters
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